Vintage Genuine Shell Filigree Necklace Pendant Gold Tone Delicate Antique Charm

This vintage/antique piece is truly one of kind, it's a seashell framed by dainty and beautiful gold tone filigree, this has no hallmarks or stamps. I've never seen another like it. It could be hand made. I've held onto this for years but it's time for it to find a new home. See photos for size.